KR100680620B1 - Variable capacity rotary compressor - Google Patents

Abstract

A variable capacity rotary compressor is provided to control compression or idling of a second compression chamber by controlling advance and retreat of a third vane with a vane control unit, thereby expanding a variable range of a compression capacity and varying the compression capacity continuously. A variable capacity rotary compressor includes first and second compression chambers(31,32) defined separately in a housing and respectively mounted with first and second rollers(42,52) inside. A first vane(43) moves to and fro in the radial direction of the first roller to define the first compression chamber. Second and third vanes(53,54) move to and fro in the radial direction of the second roller to define the second compression chamber and slide relatively. A vane control unit(70) is formed with a sealed space by the third vane partially inserted therein, wherein the vane control element restrains or releases the restraining of the third vane for varying a compression capacity.

Description

Variable Variable Rotary Compressor {VARIABLE CAPACITY ROTARY COMPRESSOR}

1 is a cross-sectional view showing a configuration of a capacity variable rotary compressor according to a first embodiment of the present invention, showing a state in which a compression operation is performed in a second compression chamber.

2 is a cross-sectional view taken along line II-II 'of FIG. 1;

3 is a cross-sectional view taken along line III-III ′ of FIG. 1.

4 is a cross-sectional view showing the configuration of the capacity variable rotary compressor according to the first embodiment of the present invention, showing a state in which idling is performed in the second compression chamber.

5 is a cross-sectional view showing a vane control device of a capacity variable rotary compressor according to a second embodiment of the present invention.

6 is a cross-sectional view showing a vane control device of a capacity variable rotary compressor according to a third embodiment of the present invention.

* Description of symbols on the main parts of the drawings *

10: sealed container 20: drive mechanism

21: rotating shaft 30: compressor section

31: first compression chamber 32: second compression chamber

42: first roller 43: first vane

52: second roller 53: second vane

54: third vane 54a: insertion portion

70: vane control unit 71: vane control unit

71a: pocket 71b: coupling hole

71c: orifice hole

The present invention relates to a capacity variable rotary compressor, and more particularly, to a variable capacity rotary compressor capable of varying the compression capacity through the control of vanes.

Korean Unexamined Patent Publication No. 10-2004-0021140 discloses a variable displacement rotary compressor for varying the compression capacity by controlling the vane movement. The rotary compressor has a housing in which a cylindrical compression chamber is formed, a roller which eccentrically rotates in the compression chamber of the housing, and vanes which retract in the radial direction of the roller. The vane is composed of a first vane of the upper and second vanes separated from each other, the first vane side is provided with a restraining means for restraining the first vane so as to space the first vane to the outer surface of the roller, if necessary It is. The rotary compressor performs idling when the first vane is restrained by the restraining means and performs a compression operation when the first vane is not restrained by the restraining means. Therefore, the compression capacity can be varied by restraining or releasing the first vane as necessary.

However, in the rotary compressor, only one compression chamber is provided, and since the compression capacity is varied by adjusting the compression operation or the idling operation under the control of the restraining means, there is a limit to varying the compression capacity in a wider range.

In addition, in the case of controlling with a piston as in the first embodiment, the main parts of the compressor had to be complicated in order to form a separate enclosed space, and in the case of controlling with the restraining pin and the restraining groove as in the second embodiment. Due to wear due to physical contact such as repetition of restraint and restraint, there is a problem in that the reliability of the capacity change when the compressor is used for a long time is deteriorated.

The present invention is to solve the above problems, an object of the present invention is to provide a variable capacity rotary compressor that can expand the variable range of the compression capacity than the conventional, it is possible to variously change the compression capacity.

It is still another object of the present invention to provide a variable displacement rotary compressor which makes the apparatus for controlling the movement of vanes simpler than the prior art.

In order to achieve the above object, the capacity-variable rotary compressor according to the present invention and the first and second compression chambers and the first and second compression chambers are respectively installed in the first and second compression chamber and rotated and A first vane for advancing in the radial direction of the first roller to partition the first compression chamber and a second vane advancing in the radial direction of the second roller for partitioning the second compression chamber and being slidably supported by each other; A vane and a third vane, and a vane control device for varying the compression capacity by restraining and releasing the third vane by inserting a portion of the third vane to form a closed space.

The vane control device may further include a vane control unit installed at a rear end side of the third vane, a first channel communicating with the vane control unit, a second channel connecting the discharge side of the compressor and the first channel, and a suction of the compressor. And a third flow path connecting a side and the first flow path, and a flow path variable valve installed at a point at which the first, second, and third flow paths are connected to each other.

In addition, the vane control unit includes a coupling hole communicating with the first flow path, a pocket into which the rear end of the third vane is inserted, and an orifice hole preventing a sudden flow between the coupling hole and the pocket.

In addition, an insertion portion inserted into the pocket is formed at a rear end of the third vane, and the cross-sectional area of the insertion portion is larger than that of the third vane.

In addition, the second vane and the third vane are integrally formed.

Hereinafter, a variable capacity rotary compressor according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 4 illustrate a capacity variable rotary compressor according to a first embodiment of the present invention.

As shown in FIG. 1, the variable-capacity rotary compressor according to the first embodiment is installed at an inner lower portion of the sealed container 10 and a driving mechanism portion 20 installed at an inner upper portion of the sealed container 10, and the drive mechanism portion ( 20 is provided with a compression mechanism unit 30 for compressing a refrigerant by driving.

Drive mechanism 20 is a cylindrical stator 22 is fixed to the inner surface of the sealed container 10, the rotor 23 is rotatably installed in the interior of the stator 22 and the rotating shaft 21 is inserted and coupled to the center of the rotor (23) It includes. In this drive mechanism 20, the rotor 23 rotates according to the application of the power, and the rotor 23 rotates the rotary shaft 21 to drive the compression mechanism unit 30.

As shown in FIGS. 1 to 3, the compression mechanism unit 30 includes a housing having a first compression chamber 31 and a second compression chamber 32 partitioned with each other, and a first and a second to compress gas. First and second compression devices 40 and 50 are provided in the two compression chambers 31 and 32, respectively.

The housing has a first cylinder 33 formed thereon with a cylindrical first compression chamber 31, a second compression chamber 32 formed with a cylindrical shape, and a second cylinder 34 installed below the first cylinder 33. , The partition plate 35 interposed between the first and second cylinders 33 and 34 to partition the first compression chamber 31 and the second compression chamber 32, and an upper side of the first compression chamber 31. First and second mounted on the upper part of the first cylinder 33 and the lower part of the second cylinder 34 so as to close the opening and the lower opening of the second compression chamber 32 and support the rotating shaft 21. Flanges 36 and 37. The rotary shaft 21 penetrates the centers of the first and second compression chambers 31 and 32 to operate the compression devices 40 and 50 in the first and second compression chambers 31 and 32.

The first and second compression apparatuses 40 and 50 include first and second eccentric cams 41 and 51 provided on the outer surfaces of the rotary shafts 21 of the respective compression chambers 31 and 32, and respective compression chambers 31 and 32. And first and second rollers 42 and 52 rotatably coupled to the outer surfaces of the first and second eccentric cams 41 and 51 so as to rotate in contact with the inner surface of the < RTI ID = 0.0 > The first eccentric cam 41 and the second eccentric cam 51 provided on the outer surface of the rotating shaft 21 are opposed to each other in order to minimize the change of the rotation torque and reduce the occurrence of vibration when the rotating shaft 21 rotates. Eccentric

In addition, the first compression device 40 includes a first vane 43 which partitions the first compression chamber 31 while advancing in the radial direction of the first compression chamber 31 as the first roller 42 rotates, And a first elastic member 44 for pressing the first vane 43 toward the first roller 42.

In addition, the second compression device 50 partitions the second compression chamber 32 while advancing in the radial direction of the second compression chamber 32 in accordance with the rotation of the second roller 52, and the surfaces in contact with each other are slidably supported. And a second vane 53 and a third vane 54, and a second elastic member 55 for pressing the second vane 53 toward the second roller 52. Therefore, the second compression chamber 32 is partitioned by the second vane 53 having a relatively large width and the third vane 54 having a relatively small width. The third vane 54 is controlled to move forward and backward by the vane control device 70 that varies the compression capacity by restraining or restraining the third vane 54. The detailed structure of the vane control apparatus 70 is mentioned later.

As shown in FIGS. 2 and 3, the first and second cylinders 33 and 34 have first and second suction holes 61 through which gas is introduced into the first and second compression chambers 31 and 32. 62 are formed, respectively, and the first and second suction pipes 15 and 16 are connected to the suction ports 61 and 62, respectively. The first and second suction pipes 15 and 16 branch off from the refrigerant suction pipe 14 extending from the accumulator 13, as shown in FIG. In addition, a first discharge port 63 and a second discharge port 64 are provided in the first flange 36 and the second flange 37 at the upper side to discharge the pressurized gas from the compression chambers 31 and 32, respectively. Is formed. Therefore, when the compressor is operated, the inside of the sealed container 10 is maintained at a high pressure by the compressed gas discharged through the first and second discharge ports 63 and 64, and the compressed gas in the sealed container 10 is sealed. 10) is guided to the outside through the discharge pipe 12 provided in the upper portion.

1 and 3, the vane control device 70 communicates with the vane control unit 71 and the vane control unit 71 provided at the rear end of the third vane 54, and communicates with the inside of the vane control unit 71. From the discharge pipe 12 to form a first pressure control pipe (73a) connected to the rear end of the vane control unit 71 and a second flow path (74) connecting the discharge side of the compressor and the first flow path (73) to form a The refrigerant suction pipe may be branched to form a second pressure control pipe 74a connected to the first pressure control pipe 73a and a third flow path 75 for communicating the suction side of the compressor with the first flow path 73. 14 is installed at a point branched from the third pressure control pipe (75a) connected to the first pressure control pipe (73a) and the first, second, third pressure control pipes (73a, 74a, 75a) A flow path variable valve 76 is included. The flow path variable valve 76 may be formed of a conventional three-way valve operated by an electric control signal.

In addition, the vane control unit 71 has a coupling hole in which the first pressure control pipe (73a) and the pocket (71a) to form a closed space is inserted into the insertion portion (54a) formed in the rear end of the third vane 54 ( 71b) and an orifice hole 71c formed between the pocket 71a and the coupling hole 71b to prevent a sudden flow between the pocket 71a and the coupling hole 71b. Since the cross-sectional area of the orifice hole 71c is smaller than the cross-sectional area of the pocket 71a, the orifice hole 71c also serves as a stopper for preventing the insertion portion 54a from being inserted any longer.

In order to improve the control force of the third vane 54 in which a part of the pocket 71a is inserted, the cross-sectional area of the insertion portion 54a formed at the rear end of the third vane 54 is larger than the cross-sectional area of the third vane 54. It is preferable to form. In addition, the pocket 71a is provided in the same shape as the cross section of the insertion portion 54a of the third vane 54 and has a slight tolerance so as not to interfere with the side surface of the pocket 71a when the insertion portion 54a is inserted. It is desirable to have.

Next, the operation of the variable displacement rotary compressor will be described.

As shown in FIG. 1, when the operation of the compressor is performed while the second flow path 74 is in communication with the first flow path 73 by the operation of the flow path variable valve 76, the vane control device 70 may operate. Since the pressure on the discharge side acts in the vane control unit 71, the insertion part 54a of the third vane 54 is pressed. Therefore, the third vane 54 is advanced and retracted in contact with the outer surface of the second roller 52 according to the rotation of the second roller 52. In addition, since the first vane 43 is pressurized by the first elastic member 44, the first vane 43 partitions the first compression chamber 31 while advancing with the rotation of the first roller 42, and the second vane 53 Since the second elastic member 55 is pressed, the second compression chamber 32 is divided while advancing with the third vane 54. Therefore, at this time, since the compression operation is performed in both the first compression chamber 31 and the second compression chamber 32, the compression capacity is maximized.

As shown in FIG. 4, when the operation of the compressor is performed while the third flow path 75 communicates with the first flow path 73 by the operation of the flow path variable valve 76, the vane control device 70 Since the pressure on the suction side acts in the vane control unit 71, the insertion part 54a of the third vane 54 is inserted into the pocket 71a by the suction force, so that the vane 54 retreats and the insertion part 54a of the vane 54a is retracted. By the retreat, the front end of the third vane 54 is kept spaced apart from the outer surface of the second roller 52, so that a connecting passage 65 is formed between the compressed space and the discharge space. Therefore, at this time, since the idling of the second compression chamber 32 is made, the compression capacity is reduced.

In this case, when the volume of the first compression chamber 31 and the volume of the second compression chamber 32 are different, the variable range of the compression capacity may be different. That is, when the ratio of the volume of the first compression chamber 31 to the volume of the second compression chamber 32 is 40:60 and the idling of the second compression chamber 32 is performed, the compression capacity is 40% of the maximum compression capacity. When the volume ratio of the first compression chamber 31 and the second compression chamber 32 is 30:70 and the idling of the second compression chamber 32 is performed, the compression capacity becomes 30% of the maximum compression capacity. .

5 is a view illustrating a vane control apparatus of a capacity variable rotary compressor according to a second embodiment of the present invention.

Unlike the first embodiment, the cross-sectional area of the insertion portion 54a 'after the third vane 54' inserted into the vane control portion 71 'of the vane control device 70 is different from that of the first embodiment. 54 '), and its shape is processed so as to correspond to a rectangle that is a cross-sectional shape of the third vane 54'. Further, the cross-sectional area of the pocket 71a 'of the vane control unit 71' is also formed so as to correspond to the cross-sectional area of the third vane 54 ', and the cross-sectional shape is also formed into a rectangle. The rest of the configuration is the same as in the first embodiment.

As such, the cross-sectional area of the insertion portion 54a 'at the rear end of the third vane 54' is formed to be the same as that of the third vane 54 ', thereby simplifying the shape of the third vane 54'. have.

6 is a view illustrating a vane control apparatus of a capacity variable rotary compressor according to a third embodiment of the present invention.

In the third embodiment, unlike the vanes in the first embodiment, which are separated into the second vane 53 and the third vane 54, the vane 80 is formed as an integrated vane 80. That is, the lower part of the vane 80 is elastically supported by the second elastic member 55 and the upper part of the vane 80 is formed to be controlled by the vane control unit 71. By forming the vanes 80 integrally as described above, the structure of the vanes 80 can be simplified, and in the case of controlling to be compressed only in the first compression chamber 31, the compression space and the discharge space of the second compression chamber 32 are The connecting passage 65 'which connects the larger is formed so that the second compression chamber 32 can reliably idle.

As described above in detail, the variable displacement rotary compressor according to the present invention performs compression or idle operation of the second compression chamber by controlling the retreat of the third vane through the vane control device while the compression operation is performed in the first compression chamber. Since it can be adjusted, the variable range of the compression capacity can be expanded than before, and the compression capacity can be continuously varied in various ways.

In addition, the present invention can simplify the configuration of the device for controlling the movement of the vane than the conventional because there is no need for a separate component to form a closed space, such as a piston, and wear because there is no physical contact in the vane control device This can solve the problem of lowering the reliability of the variable capacity.

Claims (5)

The first and second compression chambers, the first and second rollers installed in the first and second compression chambers, respectively, rotated, and the first and second compression chambers are retracted in a radial direction of the first roller, so as to partition the first compression chamber. The first vane, the second vane and the third vane which are retracted in the radial direction of the second roller to partition the second compression chamber and are slidably supported, and the rear end of the third vane is inserted into a closed space. And a vane control device configured to restrict and release the third vane to vary the compression capacity by forming a vane control device, wherein the vane control device includes: a vane control unit installed at a rear end side of the third vane and a first flow path communicating with the vane control unit; A second passage connecting the discharge side of the compressor and the first passage, a third passage connecting the suction side of the compressor and the first passage, and the first, second, and third passages connected to each other; Installed at the branch And a flow path variable valve, wherein the vane control part includes a coupling hole communicating with the first flow path, a pocket into which the rear end of the third vane is inserted, and an orifice hole for preventing rapid flow between the coupling hole and the pocket. Capacity variable rotary compressor. delete delete The method of claim 1, An insertion part inserted into the pocket is formed at a rear end of the third vane, and the cross-sectional area of the insertion part is larger than that of the third vane. The method of claim 1, The second and third vanes are variable capacity rotary compressor, characterized in that formed integrally.

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